The issue with a carbon fiber tunnel is carbon fiber flexes and deflects more than alum, BUT it comes back to original shape. Thus a carbon fiber tunnel needs to be made in a honey comb lay up for strength . This makes it either 1/4 to 5/16 thick, and that changes everything on mounting points. Honey comb lay up will make the chassis stronger by 10 times and lighter by half, than if you lay it up with just layers of carbon fiber. If you where to make just a carbon fiber with layers (.063 same as tunnel) you are looking at 5-7 layers of carbon fiber (our pre preg is .010 thick per layer, our 12K is .025 AFTER autoclave) a honey comb lay up has just 2 layers of carbon fiber each side, with a .125 or .250 layer of honey comb center. I plan on making one next summer, big project to make sure everything fits anchoring wise.
Cooling on the pro is not very good, I agree one needs a front cooler like pre 2010 or like the IQ, which is what I am doing, this would eliminate the heat exchangers running the tunnel frame rail. The exchangers being smooth is not a efficient way to cool either, more for structure I believe to the tunnel.
In the process of doing honey comb slide rails, once I am don't I will post a picture on our site of me (199 lbs) standing on them in the middle on 2- 5 gallon buckets, to show how strong they are in honey comb.
The biggest savings with carbon fiber is there is no snow build up while riding!!! I don't understand dry weight, you don't ride it dry!!! As you guys know you can add up to 20-50 lbs of ice and slush, that is where the real savings are!!
TJ